src/tools/clippy/tests/ui/as_ptr_cast_mut.rs

   1 #![allow(unused)]
   2 #![warn(clippy::as_ptr_cast_mut)]
   3 #![allow(clippy::wrong_self_convention, clippy::unnecessary_cast)]
   4
   5 struct MutPtrWrapper(Vec<u8>);
   6 impl MutPtrWrapper {
   7     fn as_ptr(&mut self) -> *const u8 {
   8         self.0.as_mut_ptr() as *const u8
   9     }
  10 }
  11
  12 struct Covariant<T>(*const T);
  13 impl<T> Covariant<T> {
  14     fn as_ptr(self) -> *const T {
  15         self.0
  16     }
  17 }
  18
  19 fn main() {
  20     let mut string = String::new();
  21     let _ = string.as_ptr() as *mut u8;
  22     let _: *mut i8 = string.as_ptr() as *mut _;
  23     let _ = string.as_ptr() as *const i8;
  24     let _ = string.as_mut_ptr();
  25     let _ = string.as_mut_ptr() as *mut u8;
  26     let _ = string.as_mut_ptr() as *const u8;
  27
  28     let nn = std::ptr::NonNull::new(4 as *mut u8).unwrap();
  29     let _ = nn.as_ptr() as *mut u8;
  30
  31     let mut wrap = MutPtrWrapper(Vec::new());
  32     let _ = wrap.as_ptr() as *mut u8;
  33
  34     let mut local = 4;
  35     let ref_with_write_perm = Covariant(std::ptr::addr_of_mut!(local) as *const _);
  36     let _ = ref_with_write_perm.as_ptr() as *mut u8;
  37 }